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Diffstat (limited to 'tests/ui/liveness/liveness-derive.rs')
-rw-r--r-- | tests/ui/liveness/liveness-derive.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tests/ui/liveness/liveness-derive.rs b/tests/ui/liveness/liveness-derive.rs new file mode 100644 index 000000000..1921d0d72 --- /dev/null +++ b/tests/ui/liveness/liveness-derive.rs @@ -0,0 +1,38 @@ +// Test for interaction between #[automatically_derived] attribute used by +// built-in derives and lints generated by liveness pass. +// +// edition:2018 +// check-pass +#![warn(unused)] + +pub trait T: Sized { + const N: usize; + fn t(&self) -> Self; +} + +impl T for u32 { + const N: usize = { + let a = 0; //~ WARN unused variable: `a` + 4 + }; + + fn t(&self) -> Self { + let b = 16; //~ WARN unused variable: `b` + 0 + } +} + +#[automatically_derived] +impl T for i32 { + const N: usize = { + let c = 0; + 4 + }; + + fn t(&self) -> Self { + let d = 17; + 0 + } +} + +fn main() {} |